Pittsburgh police sergeants Dominick Sciulli and Matthew Gauntner and Melissa Demme each entered the grand jury room individually at the federal courthouse downtown. It's unknown what was asked of them or what they said inside.

Assistant U.S. Attorney Bob Cessar was seen leaving at about 11:30 a.m. He was asked if they were done, and he nodded.

Ravenstahl's spokeswoman, Marissa Doyle, said the mayor's office had "no information" to share. She said Demme was at work earlier in the morning.

Later, Ravenstahl issued this statement: "Since the beginning of this process, my administration has cooperated fully with authorities. I intend for that practice to continue with any future inquiries, and I look forward to the revelation of all the facts."

Acting Police Chief Regina McDonald had no comment. She said Gauntner and Sciulli are still working -- Gauntner in Zone 5 and Sciulli as Ravenstahl's bodyguard.

Sciulli and Gauntner were given access to debit cards that could tap into an account at the Greater Pittsburgh Police Federal Credit Union for personal expenses when they accompanied Ravenstahl on travel outside the city.

The use of those cards came into question during the investigation of former Police Chief Nate Harper, who's now under a federal indictment and plans to plead guilty, according to his lawyer.

In February, Ravenstahl said he was not a target of an investigation when he appeared at a news conference to announce Harper's forced resignation.